Coherent structures in a boundary layer and shear layer of a turbulent backward-facing step flowA wind tunnel experiment has been carried out at the NASA Ames Research Center to analyze the evolution of coherent structures from a boundary layer to a shear layer in a turbulent, backward-facing, step flow. A miniature X-wire/cold-wire probe has been used in conjunction with two arrays of cold wires, one aligned in the plane of main shear and the other in the spanwise direction of the flow, to detect and characterize delta-scale organized structures in the outer regions of the flow and to provide detailed information concerning these structures. Kinematic features of the events associated with the large scale structures were analyzed and topological pictures of the evolving flow, as well as the contributions to the Reynolds shear stress components are presented.
Document ID
19900048203
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jovic, Srba (NASA Ames Research Center Moffett Field; Eloret Institute, Sunnyvale, CA, United States)
Browne, L. W. B. (Newcastle, University Australia)